'Un-SVN' a working copy
Solution 1:
svn export is the command you're looking for. You can export a controlled set of files to a non-controlled location and use that.
Solution 2:
Just remove all ".svn" folders in it. That's it.
Solution 3:
If you were using *nix-like tools:
find . -type d -name .svn -print0 | xargs -0 rm -fr
Solution 4:
If you're using TortoiseSVN you can just right click within the root folder of your working copy and click Export... That will work even if you have uncommited changes.
Likewise, you can just do an Export from your repository, and it won't create any of the .svn folders.
Another straightforward approach is to just delete all .svn folders as previously mentioned.